A Stability Chamber Risk Assessment is an important part of ensuring reliable equipment operation, consistent environmental conditions, and protection of stability samples. This article explains a practical FMEA-based approach for assessing risks associated with a walk-in stability chamber, including installation, qualification, utilities, HVAC, power supply, calibration, data integrity, alarms, access control, documentation, and routine operation. Each identified risk is evaluated using severity, probability, detection, and Risk Priority Number (RPN), with appropriate measures defined to control or reduce the risk.
Identifying Potential Risks Before Installation and Operation- Stability Chamber Risk Assessment
A walk-in stability chamber involves several activities and supporting systems that can affect its performance, from site preparation and equipment installation to routine operation and monitoring. A risk assessment helps identify these potential problems before they affect stability samples or interrupt the qualification and operation of the chamber.
The assessment should consider not only the chamber itself but also the surrounding facility and supporting utilities. Factors such as available installation space, floor condition, access for equipment movement, electrical supply, HVAC performance, temperature and relative humidity control, calibration, alarms, data integrity, maintenance, cleaning, and access control can all influence the reliable operation of the system.
Using FMEA to Evaluate Stability Chamber Risks
Failure Mode and Effects Analysis (FMEA) provides a structured way to examine what could go wrong, what effect the failure may have, why it could occur, and what controls are available to prevent or detect it. In the assessment, each process step is reviewed against its potential failure mode, failure effect, probable cause, and initial control measures.
The risk is then evaluated using Severity, Probability, and Detection ratings. These values are used to calculate the Risk Priority Number (RPN), which provides a practical way to prioritize identified risks and determine whether additional controls are required.
The following FMEA table presents the identified risks associated with the installation, qualification, supporting systems, and operation of the walk-in stability chamber.
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Site readiness
Inadequate space or clearance for installation
Damage to unit or surrounding structure
For introduction of new walk-in Stability Chamber, there might be space concerns or cause damage to the facility during installation.
Adequate space shall be made available for installation of new walk-in stability chamber. Area qualification shall be done accordingly URS, DQ and IOQ shall be prepared.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Floor Leveling
Uneven surfaces of floor
Improper alignment and vibration issues
Improper floor leveling cause alignment issues and vibrations during operation.
Area qualification shall be done accordingly URS, DQ and IOQ shall be prepared.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Access for movement
Doorways/ corridors too narrow
Delivery and installation obstruction
Narrow doors impact in the movement.
Access for movement is already verified before delivery and before installation. URS of area has already been prepared. DQ,IOQ and PQ of the area shall be prepared and finalized.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Material handling equipment
No lifting tools/ pellets/ jack, crane.
Risk of damage during movement
Improper handling of equipment leads to the damage.
Proper handling procedures are available at site. Chamber shall be procured in dismantled state.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Equipment procurement
Vendor supplies chamber not meeting specification.
Chamber qualification failed. Delay in use.
Chamber qualification failed. Delay in use.
Vendor documents for qualification shall be verified. URS and Design Qualification shall be verified before the procurement.
Improper equipment qualification/ oversight or incomplete documentation leads to qualification delay.
Installation, SOPs, Manuals & Qualification protocols shall be verified.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Qualification (IQ/OQ/PQ)
Incomplete IQ/OQ/PQ
Invalid stability data
Failure to meet Temperature/ RH mapping requirements.
IQ/OQ/PQ shall be performed in the site. Detailed calibration shall be performed.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Power Supply
Incorrect voltage or unstable power supply. Power failure or fluctuations
Data loss. Temperature excursion.
There might be possibilities of equipment malfunctioning or damage to the electrical circuit.
All the electrical specifications are validated. Stabilizers / UPS are in place. Diesel Generator is already in place. Walk-in stability chamber are continuously monitored by qualified electricians. Alarm notification procedure is in place in case of temperature excursion.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
HVAC & Ventilation
Poor ventilation around unit
Overheating or failure to maintain temperature conditions.
HVAC shutdown from power loss.
HVAC controls are already linked to DG set during power failure.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Relative Humidity & Temperature of the facility
Ambient conditions outside acceptance range
Chamber performance deviation.
Control facility environment or relocate installation site.
Diesel Generator in factory is already in place. HVAC system is already linked with DG. HVAC recovery study is already done and in place.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Data Integrity
Invalidated software. Network failure.
Loss or corruption of data
Invalidated software or network mode failure lead to data integrity or compliance breach.
Software validation verified. Verified data backup.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Alarm & Notification system
Faulty configuration or connection
Alarm not triggering
Faulty configuration or faulty connection leads to breach in the alarm system.
Alarms verified during qualification. Alarm challenge tests to be performed during PLC validation.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Calibration system
Improper calibration schedule
Out of tolerance instruments
Incorrect readings False compliance
Calibration records shall be verified before qualification.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Sensor Calibration
Drift in Temperature/RH sensors
Incorrect readings of Temperature/RH.
Incorrect readings False compliance
Calibration records shall be verified.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Lack of Preventive Maintenance Schedule
Unavailability or lack of PM schedule
Increased breakdown frequency. Failure of components. Reduced equipment lifespan. Decreased efficiency or performance.
Failure of components
Preventive maintenance planner is in place.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Contamination
Improper cleaning
Microbial or particulate contamination
Sample / product degradation
Procedure for cleaning is in place.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Fire Safety
Lack of proximity to fire detection/ suppression
Safety non-compliance
Lack of fire detection system may lead to the fire hazard.
Ensured fire extinguisher placement.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Access control to the persons
Unauthorized access. Failure of locking mechanism. Malfunctioning of door system. Access log failure.
Sample tampering or contamination. Inability to secure the chamber. Inability to confirm chambers status (Open/closed). Loss of traceability.
Poorly defined access control & inadequate trainings. Mechanical wear & tear of locking components or poor maintenance. Faulty or outdated sensor components. Software malfunction or human error. Insufficient data storage capacity.
Access control system is in place.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Documentation System
Human error. Human negligence.
Incomplete records. Audit observation & data gaps.
Human error & negligence lead to poor documentation system.
Proper documentation system is in place. Proper training system is in place. Proper review system is in place.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Sample placement
Operational error.
Improper sample placement
Uneven exposure to conditions.
Procedure for proper sample placement is in place.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Utility connections
Missing/ Incorrect electrical, water, or drainage connections
Installation delay or malfunction
Utility connections interruptions like missing or incorrect electrical wiring, and improper water or drainage system might cause failure mode.
Verified pre-install utility checklist. Verified connectors and load requirements.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Emergency Access
No emergency exit/ access around equipment.
Personnel safety risk
Lack of space for exit in case of emergency.
Ensured enough space for exit in case of emergency. Verified plant layout.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Process Steps
Failure mode
Failure Effect
Probable Causes
Initial Measures
Stability Chamber Operation
Chamber temperature excursion. Temperature/RH deviation beyond limits.
Stability data invalidated
Power to chamber lost. Product degradation. Data invalidation.
24/7 temperature monitoring with alarms is already in place.
Severity
Probability
Detection
RPN
Risk Level
4
4
1
16
LOW
Stability Chamber Risk Assessment-Maintaining Risk Controls During Routine Operation
Risk assessment should not be treated as a one-time documentation exercise completed only before installation. The identified controls need to remain effective throughout the lifecycle of the stability chamber. Changes in equipment, utilities, software, facility conditions, maintenance practices, or operating procedures may introduce new risks or alter existing ones.
For this reason, the risk assessment should be reviewed when significant changes occur and whenever investigations, deviations, qualification activities, or operational experience indicate that an existing control may no longer be adequate. Maintaining effective controls helps support consistent chamber performance and protects the reliability of stability data.
Conclusion of the FMEA Assessment- Stability Chamber Risk Assessment
A structured FMEA provides a practical method for identifying and controlling risks associated with a walk-in stability chamber. By evaluating the possible failure modes and establishing appropriate preventive or detective measures, the organization can address potential problems before they affect chamber performance or stability studies.
The risk assessment should therefore be used together with the applicable qualification, calibration, monitoring, maintenance, alarm, documentation, and operating procedures. This provides a systematic approach for maintaining the chamber in a controlled state throughout its intended use.
FAQ’s About Stability Chamber Risk Assessment
What is a stability chamber risk assessment?
A stability chamber risk assessment is a systematic evaluation of problems that could affect the installation, qualification, performance, or operation of a stability chamber.
Why is risk assessment important for a walk-in stability chamber?
A walk-in stability chamber depends on several supporting systems and activities, including electrical power, HVAC, temperature and relative humidity control, calibration, alarms, software, access control, and maintenance. Assessing these areas in advance helps identify weaknesses that could potentially affect chamber performance or stability data.
What is FMEA in stability chamber risk assessment?
In a stability chamber assessment, it can be used to evaluate risks associated with installation, qualification, utilities, monitoring, data integrity, and routine operation.
What parameters are used to calculate the RPN?
The Risk Priority Number (RPN) is determined using three assessment factors: Severity, Probability, and Detection. These ratings are considered together to help evaluate and prioritize the identified failure modes.
What does an RPN of 16 indicate in this risk assessment?
In the uploaded assessment, the identified failure modes are assigned a Severity rating of 4, Probability rating of 4, and Detection rating of 1, resulting in an RPN of 16. The corresponding risk level is recorded as Low.